Welcome to SIGMA Corporation

SIGMA Corporation has been manufacturing products for the North American Waterworks industry for over 20 years. We are proud to offer the highest quality ductile iron waterworks fittings, pipe restraint products, and municipal construction casting products available on the market today. SIGMA has warehouse locations across the nation and in Canada to provide the highest level of reliable service and give our customers, and their customers alike, the confidence in product well engineered product with consistent quality, delivered on time, with industry competitive pricing.